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Old 01-13-2013, 01:55 PM   #1
Forke
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2004 Impreza 2.5 TS

Default Throttle Position Sensor TPS resistance check

Video:

Summary:
Symptoms. Starting failures when engine is at running temp, but outside air temperature is less than -10c. Idle will sometimes be so low at a stop sign, that the car will stall.

Using my multimeter, I tested the resistance between pins 2 and 3. At approx 1/3 throttle the resistance is infinite. Is the TPS toast?
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Old 01-13-2013, 02:13 PM   #2
Elbert Bass
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Yup, intermittent open.

When you install new TPS you need to calibrate. Subaru says to measure at ECU - that's a pain unless you do it every day.

Back probe the TPS sensor connector with straight pins (or T-pins if you have) terminals 3 and 4, the white/red and yellow/red. With switch on and throttle closed adjust for 0.45 to 0.55 volts DC (45 to 55 mV)
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Old 01-13-2013, 03:02 PM   #3
Forke
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Thank you. Can I clarify where I'm am putting the probes? Into the back of the connection on the sensor (pictured on the right), or into the back of the larger connector that multiple sensors connect to (pictured left). Or somewhere entirely different?
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Old 01-13-2013, 11:13 PM   #4
Elbert Bass
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Quote:
Originally Posted by Forke View Post
Thank you. Can I clarify where I'm am putting the probes? Into the back of the connection on the sensor (pictured on the right), or into the back of the larger connector that multiple sensors connect to (pictured left). Or somewhere entirely different?
Back of the TPS sensor
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Old 01-18-2013, 09:57 PM   #5
Forke
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So I ordered a new TPS. Thought I would test it before installing. Oddly, I get the same results. With the multimeter at 2K, the brand new TPS reads infinite when over 1.999. Am I testing it incorrectly, or is this TPS faulty as well? I get infinite at about 1/3 of its full range of travel... Exactly the same as the sensor I was going to replace.


Disclaimer. Videotaped by the lady, while holding a new squirming puppy.

Last edited by Forke; 01-18-2013 at 10:16 PM.
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Old 01-18-2013, 10:52 PM   #6
Elbert Bass
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Operator error. You have your meter set to the 2K ohm range. That means once the resistance reaches 2000 ohms (2.0 on the meter) you go out of range. you need to be testing on the next higher resistance range. Please read the instructions for your meter so you will know what the open circuit and out of range indications are for your meter. Most meters read OL for out of range, not 1.

Ironically this topic came up while I was having lunch today with some Mitsubishi factory service/training guys.

Last edited by Elbert Bass; 01-18-2013 at 11:21 PM.
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